A Photoelectric Search for Ap-Stars in the Orion Association

Details A Photoelectric Search for Ap-Stars in the Orion Association A Photoelectric Search for Ap-Stars in the Orion Association

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....94..134j&link_type=abstract

Astronomy and Astrophysics, Vol. 94, P. 134, 1981

Astronomy and Astrophysics

Astrophysics

22

Scientific paper

We have observed a large fraction of the stars having spectral types between F0 and B5 in the Orion OB1 association using the photometric "Δα" peculiarity index that measures the strength of the 5200 Å continuum flux depression, characteristic of the Ap stars. We have obtained "Δα" observations for most of the known and suspected Ap and Helium-weak stars in the association. We find that the frequency of Ap stars in Orion is significantly lower than in the field. If the majority of the Helium-weak stars in Orion eventually acquire the Ap characteristics, the frequency of Ap stars in Orion could eventually equal the frequency in the field. Such a gradual heavy element enrichment can also explain the lower barΔα value of the Orion Ap stars.

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